الفهرس 
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Abstract
Objective: Study the effect of irrigation with diluted seawater and foliar spraying with either ascorbic or salicylic acid on some morphological characters and chemical constituents of Hibiscus rosa-sinensis L. and Myoporum pictum L. plants.
Methods& Results: The experimental layout for both plant species during both seasons was split plot design with three replicates. Irrigation with diluted seawater at the rates of 0, 10, 20, 30 and 40% of seawater was assigned to the main plots, while sub plots included spraying with tap water (without ascorbic or salicylic acid), ascorbic acid at the concentrations of 50 and 100 mg/l, and salicylic acid at 75 and 150 mg/l. Five irrigation treatments were combined with five spraying treatments to form 25 interaction treatments for each plant species.
The following measurements were recorded for both plants:
•Characteristics of shoot and root growth: plant height, number of branches per plant, number of leaves per plant, leaf area, fresh and dry weight of shoot, root length and fresh and dry weight of roots.
•Chemical composition: the content of the leaves of the total chlorophyll and chlorophyll a, b as well as carotenoids, the content of the branches of the plant from total soluble sugars , proline, nitrogen, potassium and phosphorus.
The obtained results indicated that:
•For antioxidant effect: it results showed that spraying plants with salicylic acid concentration of 150 ppm give the best values for the studied traits.
•With regard to irrigation with salt water irrigation has led the low level of salinity of the sea water diluted (10%) to increase in most measurements, and then gradually decreased with increasing salinity of irrigation water.
•Concerning the interaction, results have made it clear that the sprayed plants ascorbic acid concentration of 100 ppm or salicylic acid concentration of 150 ppm and irrigation with low level of salinity (10%) resulted in a significant increase in traits compared to other treatments.
•The lowest values recorded for these traits in plants that have not sprayed in antioxidants, which affected more growth, the more saline irrigation water.
Conclusion: The results of this study indicate that Hibiscus rosa-sinensis L. and Myoporum pictum L. can be grown successfully under irrigation with diluted seawater up to (40%) via spraying 3-4 times (one week interval) with ascorbic acid at 100 ppm or salicylic acid at 150 ppm with the possibility of spraying them once or more in the same material at intervals.